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Re: ALTER TABLE ADD COLUMN Hangs - Mailing list pgsql-admin

From Scott Marlowe
Subject Re: ALTER TABLE ADD COLUMN Hangs
Date
Msg-id t2pdcc563d11004212344n57b5ece8z62b3d1b144528095@mail.gmail.com
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In response to ALTER TABLE ADD COLUMN Hangs  (Samuel Stearns <SStearns@internode.com.au>)
List pgsql-admin
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On Wed, Apr 21, 2010 at 8:17 PM, Samuel Stearns
<SStearns@internode.com.au> wrote:
> Howdy,
>
> I’m running in an 8.3.3 environment.  What could cause, or how can I
> diagnose, why an ‘ALTER TABLE <name> ADD COLUMN’ statement runs for hours
> eventually locking users out and requiring to be killed in the end?

By any chance you got a default on there?  If so the whole table gets
updated to the default, thus rewritten and locked while this happens.

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